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Technological control method for iron casting shrinkage porosity defect

A technology of process control and iron castings, which is applied in the field of process control of shrinkage defects of iron castings, can solve the problems of high scrap rate and achieve the effect of reducing scrap rate, good effect and high efficiency

Active Publication Date: 2020-01-03
DEUTZ DALIAN ENGINE +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a process control method for shrinkage defects of iron castings to solve the problem of high scrap rate caused by shrinkage defects of iron castings

Method used

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  • Technological control method for iron casting shrinkage porosity defect
  • Technological control method for iron casting shrinkage porosity defect
  • Technological control method for iron casting shrinkage porosity defect

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0061] Embodiment 1: A process control method for shrinkage defects of a high-strength TCD cylinder head, comprising the following steps:

[0062] In the first step, a combination of vertical pouring and stepped pouring is used to set gates at the bottom and middle of the mold, and to set gates and runners evenly according to structural characteristics. The shape of the gate is set as ellipse.

[0063] The second step, sand core assembly: the internal cooling iron is set in the area of ​​the row of bolt holes closest to the isolated thermal phase area. The internal cooling iron adopts the open cylindrical shape of 1mm tinned A3 steel.

[0064] In the third step, the furnace charge is made of 65% scrap steel and 35% returned iron; the composition and content of the charge, according to the percentage of the total mass of the charge, include: C%=3.23%, Si%=1.80%, Mn%=0.5% , P%≤0.06%, S%=0.11%, Cu%=0.85%, Mo%=0.10%, Sn%=0.08%, Cr%=0.05%, and the balance is Fe.

[0065] The med...

Embodiment 2

[0080] The invention provides a process control method for the shrinkage defect of a cylinder head for an automobile, said method comprising the steps of:

[0081] The first step is to use vertical step casting combined with pouring process.

[0082] The shape of the flat gate near the isolated thermal phase area is a long strip shape, and the gate is realized by compressing one side of the circular gate in a direction away from the isolated thermal phase area, so the shape of the gate changes, but the circumference The sum area remains the same, but the distance between the overall gate and the isolated thermal phase area increases, and the shape of the gate changes accordingly.

[0083] The second step, sand core assembly: Use 0.8mm tin-plated A3 steel open cylindrical internal cooling iron to locally chill the three rows of bolt holes with the most poor feeding.

[0084] In the third step, the charge is made of 75% scrap steel and 25% returned iron, and the charge composit...

Embodiment 3

[0094] The invention provides a process control method for the shrinkage defect of a cast iron cylinder head, and the method comprises the following steps:

[0095] In the first step, the pouring system adopts the vertical step pouring process;

[0096] The shape of the flat gate is long, and the position of the gate is far away from the isolated thermal phase area relative to the round gate.

[0097] The second step, sand core assembly: use 1.2mm tin-plated A3 steel open cylindrical inner cooling iron to locally chill the row of bolt holes with poor feeding.

[0098] In the third step, the furnace charge is made of 70% scrap steel and 30% returned iron, and the charge composition is adjusted as follows: C%=3.21%, Si%=1.85%, Mn%=0.6%, P%≤0.06%, S% = 0.11%, Cu% = 0.90%, Mo% = 0.15%, Sn% = 0.08%, Cr% = 0.10%, and the balance is Fe.

[0099] The intermediate frequency coreless induction furnace is adopted, and the temperature is controlled at 1540°C for high temperature melting...

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Abstract

The invention belongs to the technical fields of novel materials and casting and discloses a technological control method for an iron casting shrinkage porosity defect. According to the technologicalcontrol method for the iron casting shrinkage porosity defect, combination of vertical type pouring and stair pouring and a pouring system with a flat gate and position of the flat gate away from an isolated hot phase area are adopted; internal chill is placed in sand core assembling; steel scrap and recirculated iron are adopted and smelted at a high temperature according to the proportion of furnace burden; in the tapping process, a carburant and a first-time nucleating agent are added with the flow, and the content of alloy elements such as chromium and molybdenum is adjusted; and a second-time nucleating agent is added with the flow in the pouring process. According to the technological control method for the iron casting shrinkage porosity defect, higher strength is acquired by castings; and meanwhile, shrinkage porosity tendency of an area with shrinkage mending difficulty is controlled to be at a lower level, it is achieved that shrinkage porosity of complex-structure castings and the rejection rate caused by pore defects are lowered synchronously, and the shrinkage porosity leakage rejection rate is below 1%.

Description

technical field [0001] The invention relates to the field of new materials and casting technology, in particular to a process control method for shrinkage defects of iron castings. Background technique [0002] High-strength cast iron is the development trend of the foundry industry, but for thin-walled iron castings with poor wall thickness uniformity, the high casting rejection rate has become a major problem hindering technology promotion. To this end, various countries have conducted a lot of research. The American Foundry Association AFS has established a special thin-wall cast iron group (TWIG) for technical research; Japan's high-strength thin-wall gray cast iron technology for the 21st century has received financial support from the government. During the "Seventh Five-Year Plan" period, my country also conducted a lot of research on high-strength cast iron, but still focused on HT200-HT250, and did not pay enough attention to high-strength cast iron above HT300, esp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22C9/08C21C1/08C22C33/08C22C37/10C22C37/06
CPCB22C9/082C21C1/08C22C33/08C22C37/06C22C37/10Y02P10/20
Inventor 刘宇张宝权崔振雷徐海涛
Owner DEUTZ DALIAN ENGINE
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